How to check the vibration motor vibration equipment and other ground fault

Multimeter test method. Line screen vibration motor low resistance with a multimeter to check file, reading very small, compared to the ground. b, observation. Feeder to observe whether the damage and charred traces visually winding ends and inner slot insulating material, if that ground. c, ZhaoOuBiao law. Use of different resistance megger insulation resistance of each group based on different levels, if the reading is zero, then the winding grounded, but electromagnets, motor insulation damp or accident and breakdown, you need judgment based on experience, Generally pointer swing in the "0" from time to time, it may be considered to have a certain resistance value. d, the test light method. If the vibration motor test lights, indicating winding grounded, if found somewhere with sparks or smoke, then where is winding ground fault point. If the lights shimmering is a ground insulation breakdown. If the light does not shine, but there test rod grounding spark, indicating winding breakdown yet, but excessive moisture. Only port can also be used in case of hardwood edge tapping, knock off a certain place and so a light, indicating the current when the pass off, then where is the ground. e, grouping elimination method. Pulverized shaker for ground and burning in the core heart more powerful, burning copper wire and core melt together. The method used is the grounded one phase winding in half, and so on, and finally find out the ground. f, current through burning method. Using a regulating transformer, connect the power, the ground heats up quickly at the insulator smoke is ground. Special attention should be small motor can not exceed twice the rated current, no more than half a minute; large supply of 20% -50% of the rated current or gradually increase the current, when the ground just smoke off immediately.